usr.sbin/rtadvd/if.c

   1 /*      $FreeBSD$       */
   2 /*      $KAME: if.c,v 1.17 2001/01/21 15:27:30 itojun Exp $     */
   3
   4 /*
   5  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
   6  * Copyright (C) 2011 Hiroki Sato <hrs@FreeBSD.org>
   7  * All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  * 3. Neither the name of the project nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #include <sys/param.h>
  35 #include <sys/socket.h>
  36 #include <sys/sysctl.h>
  37 #include <sys/ioctl.h>
  38 #include <net/if.h>
  39 #include <net/if_dl.h>
  40 #include <net/if_types.h>
  41 #include <net/ethernet.h>
  42 #include <net/route.h>
  43 #include <netinet/in.h>
  44 #include <netinet/in_var.h>
  45 #include <netinet/ip6.h>
  46 #include <netinet/icmp6.h>
  47 #include <netinet6/nd6.h>
  48 #include <unistd.h>
  49 #include <errno.h>
  50 #include <netdb.h>
  51 #include <stdlib.h>
  52 #include <string.h>
  53 #include <syslog.h>
  54
  55 #include "pathnames.h"
  56 #include "rtadvd.h"
  57 #include "if.h"
  58
  59 #define ROUNDUP(a, size)                                        \
  60         (((a) & ((size)-1)) ? (1 + ((a) | ((size)-1))) : (a))
  61
  62 #define NEXT_SA(ap)                                                     \
  63         (ap) = (struct sockaddr *)((caddr_t)(ap) +                      \
  64             ((ap)->sa_len ? ROUNDUP((ap)->sa_len, sizeof(u_long)) :     \
  65             sizeof(u_long)))
  66
  67 struct sockaddr_in6 sin6_linklocal_allnodes = {
  68         .sin6_len =     sizeof(sin6_linklocal_allnodes),
  69         .sin6_family =  AF_INET6,
  70         .sin6_addr =    IN6ADDR_LINKLOCAL_ALLNODES_INIT,
  71 };
  72
  73 struct sockaddr_in6 sin6_linklocal_allrouters = {
  74         .sin6_len =     sizeof(sin6_linklocal_allrouters),
  75         .sin6_family =  AF_INET6,
  76         .sin6_addr =    IN6ADDR_LINKLOCAL_ALLROUTERS_INIT,
  77 };
  78
  79 struct sockaddr_in6 sin6_sitelocal_allrouters = {
  80         .sin6_len =     sizeof(sin6_sitelocal_allrouters),
  81         .sin6_family =  AF_INET6,
  82         .sin6_addr =    IN6ADDR_SITELOCAL_ALLROUTERS_INIT,
  83 };
  84
  85 struct sockinfo sock = { .si_fd = -1, .si_name = NULL };
  86 struct sockinfo rtsock = { .si_fd = -1, .si_name = NULL };
  87 struct sockinfo ctrlsock = { .si_fd = -1, .si_name = _PATH_CTRL_SOCK };
  88
  89 char *mcastif;
  90
  91 static void             get_rtaddrs(int, struct sockaddr *,
  92                             struct sockaddr **);
  93 static struct if_msghdr *get_next_msghdr(struct if_msghdr *,
  94                             struct if_msghdr *);
  95
  96 static void
  97 get_rtaddrs(int addrs, struct sockaddr *sa, struct sockaddr **rti_info)
  98 {
  99         int i;
 100
 101         for (i = 0; i < RTAX_MAX; i++) {
 102                 if (addrs & (1 << i)) {
 103                         rti_info[i] = sa;
 104                         NEXT_SA(sa);
 105                 }
 106                 else
 107                         rti_info[i] = NULL;
 108         }
 109 }
 110
 111 #define ROUNDUP8(a) (1 + (((a) - 1) | 7))
 112 int
 113 lladdropt_length(struct sockaddr_dl *sdl)
 114 {
 115         switch (sdl->sdl_type) {
 116         case IFT_ETHER:
 117         case IFT_L2VLAN:
 118         case IFT_BRIDGE:
 119                 return (ROUNDUP8(ETHER_ADDR_LEN + 2));
 120         default:
 121                 return (0);
 122         }
 123 }
 124
 125 void
 126 lladdropt_fill(struct sockaddr_dl *sdl, struct nd_opt_hdr *ndopt)
 127 {
 128         char *addr;
 129
 130         ndopt->nd_opt_type = ND_OPT_SOURCE_LINKADDR; /* fixed */
 131
 132         switch (sdl->sdl_type) {
 133         case IFT_ETHER:
 134         case IFT_L2VLAN:
 135         case IFT_BRIDGE:
 136                 ndopt->nd_opt_len = (ROUNDUP8(ETHER_ADDR_LEN + 2)) >> 3;
 137                 addr = (char *)(ndopt + 1);
 138                 memcpy(addr, LLADDR(sdl), ETHER_ADDR_LEN);
 139                 break;
 140         default:
 141                 syslog(LOG_ERR, "<%s> unsupported link type(%d)",
 142                     __func__, sdl->sdl_type);
 143                 exit(1);
 144         }
 145
 146         return;
 147 }
 148
 149 int
 150 rtbuf_len(void)
 151 {
 152         size_t len;
 153         int mib[6] = {CTL_NET, AF_ROUTE, 0, AF_INET6, NET_RT_DUMP, 0};
 154
 155         if (sysctl(mib, 6, NULL, &len, NULL, 0) < 0)
 156                 return (-1);
 157
 158         return (len);
 159 }
 160
 161 #define FILTER_MATCH(type, filter) ((0x1 << type) & filter)
 162 #define SIN6(s) ((struct sockaddr_in6 *)(s))
 163 #define SDL(s) ((struct sockaddr_dl *)(s))
 164 char *
 165 get_next_msg(char *buf, char *lim, int ifindex, size_t *lenp, int filter)
 166 {
 167         struct rt_msghdr *rtm;
 168         struct ifa_msghdr *ifam;
 169         struct sockaddr *sa, *dst, *gw, *ifa, *rti_info[RTAX_MAX];
 170
 171         *lenp = 0;
 172         for (rtm = (struct rt_msghdr *)buf;
 173              rtm < (struct rt_msghdr *)lim;
 174              rtm = (struct rt_msghdr *)(((char *)rtm) + rtm->rtm_msglen)) {
 175                 /* just for safety */
 176                 if (!rtm->rtm_msglen) {
 177                         syslog(LOG_WARNING, "<%s> rtm_msglen is 0 "
 178                             "(buf=%p lim=%p rtm=%p)", __func__,
 179                             buf, lim, rtm);
 180                         break;
 181                 }
 182                 if (((struct rt_msghdr *)buf)->rtm_version != RTM_VERSION) {
 183                         syslog(LOG_WARNING,
 184                             "<%s> routing message version mismatch "
 185                             "(buf=%p lim=%p rtm=%p)", __func__,
 186                             buf, lim, rtm);
 187                         continue;
 188                 }
 189
 190                 if (FILTER_MATCH(rtm->rtm_type, filter) == 0)
 191                         continue;
 192
 193                 switch (rtm->rtm_type) {
 194                 case RTM_GET:
 195                 case RTM_ADD:
 196                 case RTM_DELETE:
 197                         /* address related checks */
 198                         sa = (struct sockaddr *)(rtm + 1);
 199                         get_rtaddrs(rtm->rtm_addrs, sa, rti_info);
 200                         if ((dst = rti_info[RTAX_DST]) == NULL ||
 201                             dst->sa_family != AF_INET6)
 202                                 continue;
 203
 204                         if (IN6_IS_ADDR_LINKLOCAL(&SIN6(dst)->sin6_addr) ||
 205                             IN6_IS_ADDR_MULTICAST(&SIN6(dst)->sin6_addr))
 206                                 continue;
 207
 208                         if ((gw = rti_info[RTAX_GATEWAY]) == NULL ||
 209                             gw->sa_family != AF_LINK)
 210                                 continue;
 211                         if (ifindex && SDL(gw)->sdl_index != ifindex)
 212                                 continue;
 213
 214                         if (rti_info[RTAX_NETMASK] == NULL)
 215                                 continue;
 216
 217                         /* found */
 218                         *lenp = rtm->rtm_msglen;
 219                         return (char *)rtm;
 220                         /* NOTREACHED */
 221                 case RTM_NEWADDR:
 222                 case RTM_DELADDR:
 223                         ifam = (struct ifa_msghdr *)rtm;
 224
 225                         /* address related checks */
 226                         sa = (struct sockaddr *)(ifam + 1);
 227                         get_rtaddrs(ifam->ifam_addrs, sa, rti_info);
 228                         if ((ifa = rti_info[RTAX_IFA]) == NULL ||
 229                             (ifa->sa_family != AF_INET &&
 230                              ifa->sa_family != AF_INET6))
 231                                 continue;
 232
 233                         if (ifa->sa_family == AF_INET6 &&
 234                             (IN6_IS_ADDR_LINKLOCAL(&SIN6(ifa)->sin6_addr) ||
 235                              IN6_IS_ADDR_MULTICAST(&SIN6(ifa)->sin6_addr)))
 236                                 continue;
 237
 238                         if (ifindex && ifam->ifam_index != ifindex)
 239                                 continue;
 240
 241                         /* found */
 242                         *lenp = ifam->ifam_msglen;
 243                         return (char *)rtm;
 244                         /* NOTREACHED */
 245                 case RTM_IFINFO:
 246                 case RTM_IFANNOUNCE:
 247                         /* found */
 248                         *lenp = rtm->rtm_msglen;
 249                         return (char *)rtm;
 250                         /* NOTREACHED */
 251                 }
 252         }
 253
 254         return ((char *)rtm);
 255 }
 256 #undef FILTER_MATCH
 257
 258 struct in6_addr *
 259 get_addr(char *buf)
 260 {
 261         struct rt_msghdr *rtm = (struct rt_msghdr *)buf;
 262         struct sockaddr *sa, *rti_info[RTAX_MAX];
 263
 264         sa = (struct sockaddr *)(rtm + 1);
 265         get_rtaddrs(rtm->rtm_addrs, sa, rti_info);
 266
 267         return (&SIN6(rti_info[RTAX_DST])->sin6_addr);
 268 }
 269
 270 int
 271 get_rtm_ifindex(char *buf)
 272 {
 273         struct rt_msghdr *rtm = (struct rt_msghdr *)buf;
 274         struct sockaddr *sa, *rti_info[RTAX_MAX];
 275
 276         sa = (struct sockaddr *)(rtm + 1);
 277         get_rtaddrs(rtm->rtm_addrs, sa, rti_info);
 278
 279         return (((struct sockaddr_dl *)rti_info[RTAX_GATEWAY])->sdl_index);
 280 }
 281
 282 int
 283 get_prefixlen(char *buf)
 284 {
 285         struct rt_msghdr *rtm = (struct rt_msghdr *)buf;
 286         struct sockaddr *sa, *rti_info[RTAX_MAX];
 287         char *p, *lim;
 288
 289         sa = (struct sockaddr *)(rtm + 1);
 290         get_rtaddrs(rtm->rtm_addrs, sa, rti_info);
 291         sa = rti_info[RTAX_NETMASK];
 292
 293         p = (char *)(&SIN6(sa)->sin6_addr);
 294         lim = (char *)sa + sa->sa_len;
 295         return prefixlen(p, lim);
 296 }
 297
 298 int
 299 prefixlen(unsigned char *p, unsigned char *lim)
 300 {
 301         int masklen;
 302
 303         for (masklen = 0; p < lim; p++) {
 304                 switch (*p) {
 305                 case 0xff:
 306                         masklen += 8;
 307                         break;
 308                 case 0xfe:
 309                         masklen += 7;
 310                         break;
 311                 case 0xfc:
 312                         masklen += 6;
 313                         break;
 314                 case 0xf8:
 315                         masklen += 5;
 316                         break;
 317                 case 0xf0:
 318                         masklen += 4;
 319                         break;
 320                 case 0xe0:
 321                         masklen += 3;
 322                         break;
 323                 case 0xc0:
 324                         masklen += 2;
 325                         break;
 326                 case 0x80:
 327                         masklen += 1;
 328                         break;
 329                 case 0x00:
 330                         break;
 331                 default:
 332                         return (-1);
 333                 }
 334         }
 335
 336         return (masklen);
 337 }
 338
 339 struct ifinfo *
 340 update_persist_ifinfo(struct ifilist_head_t *ifi_head, const char *ifname)
 341 {
 342         struct ifinfo *ifi;
 343         int ifindex;
 344
 345         ifi = NULL;
 346         ifindex = if_nametoindex(ifname);
 347         TAILQ_FOREACH(ifi, ifi_head, ifi_next) {
 348                 if (ifindex != 0) {
 349                         if (ifindex == ifi->ifi_ifindex)
 350                                 break;
 351                 } else {
 352                         if (strncmp(ifname, ifi->ifi_ifname,
 353                                 sizeof(ifi->ifi_ifname)) == 0)
 354                                 break;
 355                 }
 356         }
 357
 358         if (ifi == NULL) {
 359                 /* A new ifinfo element is needed. */
 360                 syslog(LOG_DEBUG, "<%s> new entry: %s", __func__,
 361                     ifname);
 362
 363                 ELM_MALLOC(ifi, exit(1));
 364                 ifi->ifi_ifindex = 0;
 365                 strlcpy(ifi->ifi_ifname, ifname, sizeof(ifi->ifi_ifname));
 366                 ifi->ifi_rainfo = NULL;
 367                 ifi->ifi_state = IFI_STATE_UNCONFIGURED;
 368                 TAILQ_INSERT_TAIL(ifi_head, ifi, ifi_next);
 369         }
 370
 371         ifi->ifi_persist = 1;
 372
 373         syslog(LOG_DEBUG, "<%s> %s is marked PERSIST", __func__,
 374             ifi->ifi_ifname);
 375         syslog(LOG_DEBUG, "<%s> %s is state = %d", __func__,
 376             ifi->ifi_ifname, ifi->ifi_state);
 377         return (ifi);
 378 }
 379
 380 int
 381 update_ifinfo_nd_flags(struct ifinfo *ifi)
 382 {
 383         struct in6_ndireq nd;
 384         int s;
 385         int error;
 386
 387         if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
 388                 syslog(LOG_ERR,
 389                     "<%s> socket() failed.", __func__);
 390                 return (1);
 391         }
 392         /* ND flags */
 393         memset(&nd, 0, sizeof(nd));
 394         strlcpy(nd.ifname, ifi->ifi_ifname,
 395             sizeof(nd.ifname));
 396         error = ioctl(s, SIOCGIFINFO_IN6, (caddr_t)&nd);
 397         if (error) {
 398                 close(s);
 399                 if (errno != EPFNOSUPPORT)
 400                         syslog(LOG_ERR, "<%s> ioctl() failed.", __func__);
 401                 return (1);
 402         }
 403         ifi->ifi_nd_flags = nd.ndi.flags;
 404         close(s);
 405
 406         return (0);
 407 }
 408
 409 struct ifinfo *
 410 update_ifinfo(struct ifilist_head_t *ifi_head, int ifindex)
 411 {
 412         struct if_msghdr *ifm;
 413         struct ifinfo *ifi = NULL;
 414         struct sockaddr *sa;
 415         struct sockaddr *rti_info[RTAX_MAX];
 416         char *msg;
 417         size_t len;
 418         char *lim;
 419         int mib[] = { CTL_NET, PF_ROUTE, 0, AF_INET6, NET_RT_IFLIST, 0 };
 420         int error;
 421
 422         syslog(LOG_DEBUG, "<%s> enter", __func__);
 423
 424         if (sysctl(mib, sizeof(mib)/sizeof(mib[0]), NULL, &len, NULL, 0) <
 425             0) {
 426                 syslog(LOG_ERR,
 427                     "<%s> sysctl: NET_RT_IFLIST size get failed", __func__);
 428                 exit(1);
 429         }
 430         if ((msg = malloc(len)) == NULL) {
 431                 syslog(LOG_ERR, "<%s> malloc failed", __func__);
 432                 exit(1);
 433         }
 434         if (sysctl(mib, sizeof(mib)/sizeof(mib[0]), msg, &len, NULL, 0) <
 435             0) {
 436                 syslog(LOG_ERR,
 437                     "<%s> sysctl: NET_RT_IFLIST get failed", __func__);
 438                 exit(1);
 439         }
 440
 441         lim = msg + len;
 442         for (ifm = (struct if_msghdr *)msg;
 443              ifm != NULL && ifm < (struct if_msghdr *)lim;
 444              ifm = get_next_msghdr(ifm,(struct if_msghdr *)lim)) {
 445                 int ifi_new;
 446
 447                 syslog(LOG_DEBUG, "<%s> ifm = %p, lim = %p, diff = %zu",
 448                     __func__, ifm, lim, (char *)lim - (char *)ifm);
 449
 450                 if (ifm->ifm_version != RTM_VERSION) {
 451                         syslog(LOG_ERR,
 452                             "<%s> ifm_vesrion mismatch", __func__);
 453                         exit(1);
 454                 }
 455                 if (ifm->ifm_msglen == 0) {
 456                         syslog(LOG_WARNING,
 457                             "<%s> ifm_msglen is 0", __func__);
 458                         free(msg);
 459                         return (NULL);
 460                 }
 461
 462                 ifi_new = 0;
 463                 if (ifm->ifm_type == RTM_IFINFO) {
 464                         struct ifreq ifr;
 465                         int s;
 466                         char ifname[IFNAMSIZ];
 467
 468                         syslog(LOG_DEBUG, "<%s> RTM_IFINFO found. "
 469                             "ifm_index = %d, ifindex = %d",
 470                             __func__, ifm->ifm_index, ifindex);
 471
 472                         /* when ifindex is specified */
 473                         if (ifindex != UPDATE_IFINFO_ALL &&
 474                             ifindex != ifm->ifm_index)
 475                                 continue;
 476
 477                         /* ifname */
 478                         if (if_indextoname(ifm->ifm_index, ifname) == NULL) {
 479                                 syslog(LOG_WARNING,
 480                                     "<%s> ifname not found (idx=%d)",
 481                                     __func__, ifm->ifm_index);
 482                                 continue;
 483                         }
 484
 485                         /* lookup an entry with the same ifindex */
 486                         TAILQ_FOREACH(ifi, ifi_head, ifi_next) {
 487                                 if (ifm->ifm_index == ifi->ifi_ifindex)
 488                                         break;
 489                                 if (strncmp(ifname, ifi->ifi_ifname,
 490                                         sizeof(ifname)) == 0)
 491                                         break;
 492                         }
 493                         if (ifi == NULL) {
 494                                 syslog(LOG_DEBUG,
 495                                     "<%s> new entry for idx=%d",
 496                                     __func__, ifm->ifm_index);
 497                                 ELM_MALLOC(ifi, exit(1));
 498                                 ifi->ifi_rainfo = NULL;
 499                                 ifi->ifi_state = IFI_STATE_UNCONFIGURED;
 500                                 ifi->ifi_persist = 0;
 501                                 ifi_new = 1;
 502                         }
 503                         /* ifindex */
 504                         ifi->ifi_ifindex = ifm->ifm_index;
 505
 506                         /* ifname */
 507                         strlcpy(ifi->ifi_ifname, ifname, IFNAMSIZ);
 508
 509                         if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
 510                                 syslog(LOG_ERR,
 511                                     "<%s> socket() failed.", __func__);
 512                                 if (ifi_new)
 513                                         free(ifi);
 514                                 continue;
 515                         }
 516
 517                         /* MTU  */
 518                         ifi->ifi_phymtu = ifm->ifm_data.ifi_mtu;
 519                         if (ifi->ifi_phymtu == 0) {
 520                                 memset(&ifr, 0, sizeof(ifr));
 521                                 ifr.ifr_addr.sa_family = AF_INET6;
 522                                 strlcpy(ifr.ifr_name, ifi->ifi_ifname,
 523                                     sizeof(ifr.ifr_name));
 524                                 error = ioctl(s, SIOCGIFMTU, (caddr_t)&ifr);
 525                                 if (error) {
 526                                         close(s);
 527                                         syslog(LOG_ERR,
 528                                             "<%s> ioctl() failed.",
 529                                             __func__);
 530                                         if (ifi_new)
 531                                                 free(ifi);
 532                                         continue;
 533                                 }
 534                                 ifi->ifi_phymtu = ifr.ifr_mtu;
 535                                 if (ifi->ifi_phymtu == 0) {
 536                                         syslog(LOG_WARNING,
 537                                             "<%s> no interface mtu info"
 538                                             " on %s.  %d will be used.",
 539                                             __func__, ifi->ifi_ifname,
 540                                             IPV6_MMTU);
 541                                         ifi->ifi_phymtu = IPV6_MMTU;
 542                                 }
 543                         }
 544                         close(s);
 545
 546                         /* ND flags */
 547                         error = update_ifinfo_nd_flags(ifi);
 548                         if (error) {
 549                                 if (ifi_new)
 550                                         free(ifi);
 551                                 continue;
 552                         }
 553
 554                         /* SDL */
 555                         sa = (struct sockaddr *)(ifm + 1);
 556                         get_rtaddrs(ifm->ifm_addrs, sa, rti_info);
 557                         if ((sa = rti_info[RTAX_IFP]) != NULL) {
 558                                 if (sa->sa_family == AF_LINK) {
 559                                         memcpy(&ifi->ifi_sdl,
 560                                             (struct sockaddr_dl *)sa,
 561                                             sizeof(ifi->ifi_sdl));
 562                                 }
 563                         } else
 564                                 memset(&ifi->ifi_sdl, 0,
 565                                     sizeof(ifi->ifi_sdl));
 566
 567                         /* flags */
 568                         ifi->ifi_flags = ifm->ifm_flags;
 569
 570                         /* type */
 571                         ifi->ifi_type = ifm->ifm_type;
 572                 } else {
 573                         syslog(LOG_ERR,
 574                             "out of sync parsing NET_RT_IFLIST\n"
 575                             "expected %d, got %d\n msglen = %d\n",
 576                             RTM_IFINFO, ifm->ifm_type, ifm->ifm_msglen);
 577                         exit(1);
 578                 }
 579
 580                 if (ifi_new) {
 581                         syslog(LOG_DEBUG,
 582                             "<%s> adding %s(idx=%d) to ifilist",
 583                             __func__, ifi->ifi_ifname, ifi->ifi_ifindex);
 584                         TAILQ_INSERT_TAIL(ifi_head, ifi, ifi_next);
 585                 }
 586         }
 587         free(msg);
 588
 589         if (mcastif != NULL) {
 590                 error = sock_mc_rr_update(&sock, mcastif);
 591                 if (error)
 592                         exit(1);
 593         }
 594
 595         return (ifi);
 596 }
 597
 598 static struct if_msghdr *
 599 get_next_msghdr(struct if_msghdr *ifm, struct if_msghdr *lim)
 600 {
 601         struct ifa_msghdr *ifam;
 602
 603         for (ifam = (struct ifa_msghdr *)((char *)ifm + ifm->ifm_msglen);
 604              ifam < (struct ifa_msghdr *)lim;
 605              ifam = (struct ifa_msghdr *)((char *)ifam + ifam->ifam_msglen)) {
 606                 if (!ifam->ifam_msglen) {
 607                         syslog(LOG_WARNING,
 608                             "<%s> ifa_msglen is 0", __func__);
 609                         return (NULL);
 610                 }
 611                 if (ifam->ifam_type != RTM_NEWADDR)
 612                         break;
 613         }
 614
 615         return ((struct if_msghdr *)ifam);
 616 }
 617
 618 int
 619 getinet6sysctl(int code)
 620 {
 621         int mib[] = { CTL_NET, PF_INET6, IPPROTO_IPV6, 0 };
 622         int value;
 623         size_t size;
 624
 625         mib[3] = code;
 626         size = sizeof(value);
 627         if (sysctl(mib, sizeof(mib)/sizeof(mib[0]), &value, &size, NULL, 0)
 628             < 0) {
 629                 syslog(LOG_ERR, "<%s>: failed to get ip6 sysctl(%d): %s",
 630                     __func__, code,
 631                     strerror(errno));
 632                 return (-1);
 633         }
 634         else
 635                 return (value);
 636 }
 637
 638
 639 int
 640 sock_mc_join(struct sockinfo *s, int ifindex)
 641 {
 642         struct ipv6_mreq mreq;
 643         char ifname[IFNAMSIZ];
 644
 645         syslog(LOG_DEBUG, "<%s> enter", __func__);
 646
 647         if (ifindex == 0)
 648                 return (1);
 649
 650         /*
 651          * join all routers multicast address on each advertising
 652          * interface.
 653          */
 654         memset(&mreq, 0, sizeof(mreq));
 655         /* XXX */
 656         memcpy(&mreq.ipv6mr_multiaddr.s6_addr,
 657             &sin6_linklocal_allrouters.sin6_addr,
 658             sizeof(mreq.ipv6mr_multiaddr.s6_addr));
 659
 660         mreq.ipv6mr_interface = ifindex;
 661         if (setsockopt(s->si_fd, IPPROTO_IPV6, IPV6_JOIN_GROUP, &mreq,
 662                 sizeof(mreq)) < 0) {
 663                 syslog(LOG_ERR,
 664                     "<%s> IPV6_JOIN_GROUP(link) on %s: %s",
 665                     __func__, if_indextoname(ifindex, ifname),
 666                     strerror(errno));
 667                 return (1);
 668         }
 669         syslog(LOG_DEBUG,
 670             "<%s> %s: join link-local all-routers MC group",
 671             __func__, if_indextoname(ifindex, ifname));
 672
 673         return (0);
 674 }
 675
 676 int
 677 sock_mc_leave(struct sockinfo *s, int ifindex)
 678 {
 679         struct ipv6_mreq mreq;
 680         char ifname[IFNAMSIZ];
 681
 682         syslog(LOG_DEBUG, "<%s> enter", __func__);
 683
 684         if (ifindex == 0)
 685                 return (1);
 686
 687         /*
 688          * join all routers multicast address on each advertising
 689          * interface.
 690          */
 691
 692         memset(&mreq, 0, sizeof(mreq));
 693         /* XXX */
 694         memcpy(&mreq.ipv6mr_multiaddr.s6_addr,
 695             &sin6_linklocal_allrouters.sin6_addr,
 696             sizeof(mreq.ipv6mr_multiaddr.s6_addr));
 697
 698         mreq.ipv6mr_interface = ifindex;
 699         if (setsockopt(s->si_fd, IPPROTO_IPV6, IPV6_LEAVE_GROUP, &mreq,
 700                 sizeof(mreq)) < 0) {
 701                 syslog(LOG_ERR,
 702                     "<%s> IPV6_JOIN_LEAVE(link) on %s: %s",
 703                     __func__, if_indextoname(ifindex, ifname),
 704                     strerror(errno));
 705                 return (1);
 706         }
 707         syslog(LOG_DEBUG,
 708             "<%s> %s: leave link-local all-routers MC group",
 709             __func__, if_indextoname(ifindex, ifname));
 710
 711         return (0);
 712 }
 713
 714 int
 715 sock_mc_rr_update(struct sockinfo *s, char *mif)
 716 {
 717         struct ipv6_mreq mreq;
 718
 719         syslog(LOG_DEBUG, "<%s> enter", __func__);
 720
 721         if (mif == NULL)
 722                 return (1);
 723         /*
 724          * When attending router renumbering, join all-routers site-local
 725          * multicast group.
 726          */
 727         /* XXX */
 728         memcpy(&mreq.ipv6mr_multiaddr.s6_addr,
 729             &sin6_sitelocal_allrouters.sin6_addr,
 730             sizeof(mreq.ipv6mr_multiaddr.s6_addr));
 731         if ((mreq.ipv6mr_interface = if_nametoindex(mif)) == 0) {
 732                 syslog(LOG_ERR,
 733                     "<%s> invalid interface: %s",
 734                     __func__, mif);
 735                 return (1);
 736         }
 737
 738         if (setsockopt(s->si_fd, IPPROTO_IPV6, IPV6_JOIN_GROUP,
 739                 &mreq, sizeof(mreq)) < 0) {
 740                 syslog(LOG_ERR,
 741                     "<%s> IPV6_JOIN_GROUP(site) on %s: %s",
 742                     __func__, mif, strerror(errno));
 743                 return (1);
 744         }
 745
 746         syslog(LOG_DEBUG,
 747             "<%s> %s: join site-local all-routers MC group",
 748             __func__, mif);
 749
 750         return (0);
 751 }